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Pension and Other Postretirement Benefits - The Components of the Net Pension Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Employee Pension Plan [Member]    
Interest cost $ 163 $ 199
Amortization of unrecognized (gain) loss 111 67
Expected return on plan assets (257) (272)
Net pension (benefit) expense 17 (6)
Directors' Plan [Member]    
Interest cost 16 21
Amortization of unrecognized (gain) loss (14) (35)
Net pension (benefit) expense 6 (4)
Service cost 4 10
Amortization of past service credit 0 0
Other Post Retirement Benefit Plan Defined Benefit [Member]    
Interest cost 65 85
Net pension (benefit) expense 114 133
Service cost 69 70
Amortization of past service credit $ (20) $ (22)